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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7651af47da9d86793fb5caec9eedbd34347e0786836a465a335ee77e4fe60b' 
  AND token = 'wc62ByFT8Ton2HV5wWghr/0yP3AhgiGc3NKFSiU1h/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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