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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e30205990c87acf70784660659728395dbe84e1111ac351a6a93def28601b4' 
  AND token = 'Kcsc6aK2ixzMssqAZICbWAul0tetwhZZWkWDN1nPdds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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