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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23705170c7089a055d5e99d04c1be515ce6cf37afda14ed5aff418c9cb42c1a' 
  AND token = 'GS/8YJennozLLUsxPVgJ5c6/oxOg0wFDsvxje2MPOBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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