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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2338632c5f8cad06f85d0fb5eb60cd3f19c629a7aec89a418aa8541b98e65ca4' 
  AND token = '4wxiveEU5Z5bcDRgYsrcRJotagEkdo/mhci2CfeQwJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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