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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890769c78f90a8a8828c762f9c4d59ad8b037d087fdb8db4e4238ad908c3aed9' 
  AND token = 'Zw7ffnDEbdmtAkRbkyBi5TzZshR/KI/lfXB/Nk7r6zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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