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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3d53dca877bbe38f2c212497ac4ba4fd8c061328f955a1446b7217776a3631' 
  AND token = '6F2PdZbrphMidRINMJRwuPOxqUI2zjvocyjK9J5s9cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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