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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4a2b3e1364254a4fff74cdef54be3c3849d4c47243d27ec109db366145e317' 
  AND token = 'OK8hDifeINjdA7di1PYalspbBdn8nE3H3CK/f0/SCIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}