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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12e5e2063e65a2c53e9c38630e02942ff57f352c2dc61e024ab48adf2e68be9' 
  AND token = 'nYJ6MT2Y/grAAanrVO1Jr3H5rxt3bDScwOND9bnsiro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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