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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f796b199caecccb27b662b97ea7f2251db0aa752a88948fefda939d701e4c8d2' 
  AND token = 'aqFsVAt4RnciF2Pxy4osIpyWr8GHlJIOc3gMawGY+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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