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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4932a6d80843831ce6041047d3e6da5f1e14e1f8c72ed2ed96e7cb5db52063' 
  AND token = 'Hx0fvm9SyyrwShJF5hs1HWvV4Jkkxz6ndljo+AsyEGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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