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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb8a35b2d1c446b8320a73968e8d8e45f3c9e29cf3e2e1766fe9351dd6ac78b' 
  AND token = 'putBCHPQ7ieIFeM22NoItaeVhpGn4reeudHmnNz374s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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