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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef941a4fd213adc6d99ed9a87346bdd53c4c2f7c98ebdc1fc3557b0386892874' 
  AND token = 'c+qst7Ve/ReAnSd8+EitCohNBuJWueqBNPTZOSnr1CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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