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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e6d6ee101c8b8437beea7a1ba6b668e56a65683356a24e75986bb9dcb9482c' 
  AND token = 'wJuKetZCB0zDjY3Q4j5v2FpI/g4c3gwjhTJTopxpn3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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