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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cacdcd272d39f494f56421b2acd5bacc5d60c05fc606c2c4c4eba647a3cb13' 
  AND token = '7o+si1DEkaNMBp+qVQtnIFM64KDnWqD+MkswYDUKi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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