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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c44ccc4dc367f77b169aba89a923c78f6f3171cd05d2d6ac9126f407d9fa46c' 
  AND token = '2BsbohekWEKtaEPjQmjWih0YQZh4opRP8qeeKLB0vUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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