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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a8655c3e78581786aeb830debeb7469e248eec508dda796ecd24f2b2a286cf' 
  AND token = 'Kk0vWwbwXUUPdOcnSEh+X2cKFlAhHutfOB363vje9Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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