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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d9c7ce08b3a7494077f38e53a0459e5995eae6ae4a20659334950dedc5786e' 
  AND token = '2MFKzV+QYYWgANMjS25QaR2XCaTCvu2GHyeylJ+uyD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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