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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f681564d19cb2024aceee74d837a202f92e609cd4c7c6caff322c38d6c92eb' 
  AND token = 'XGdGgpZRkErR2nKCuNW4qTlTwnEVmP2SNL0Q7r3s+0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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