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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5628e1b3e43a00b24f7a9bb451b75c3275d2ab30a0b32cb3d4bb8fd8c4051e3c' 
  AND token = 'uRdBIgc127pRHpZQinbZhkEk3nRDc74T6nLkqQbEQ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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