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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1a6e74c4ba0261979ba5d1f46ae6ccbd6b2b30a75c082b92675f2075f32978' 
  AND token = 'FvPUUgGM8w9v3xJwz/bqDiNqzvcyA4Ti81ObHvaVb9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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