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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ddcfe630abb59e801acbc60dbf27a05abee35330a668b82e2228ac57b8f964c' 
  AND token = 'ZhS62V6GmBUZalZfp0oqGSLT1L6emLL8j/WS3k05G5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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