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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1775ecf28db43025ea9af6ba60a1d1450b840cf96ee207b92cb842061a01e81b' 
  AND token = 'EHF5hNGn0c8XexYs2ZStcmGqGcQF0SmPGHjUFWnYTK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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