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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddd790f5f19146c4786a9d176e6f48e292748c0abc1f4b5f9970320a839bafc' 
  AND token = '/sllq0AhFjJaSNANl/QdpAVi1vIgIOLvbBw8cDdabWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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