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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc78471cb4306b54edda07dab619c2430840ba149cacb1bae94c5ef323c0175e' 
  AND token = 'esUV5wBh9tw/jf5gunXs50NvIRA4uPN+BeKNGDGtL30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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