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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa688a9e110e6752d0682e0fe77bd8264d42390892fccf6190d38bcb9f7c3f8a' 
  AND token = 'Htnw1G9HHcI5poVzNPNT096Fx2k3cDvLvULi1osJs+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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