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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1679546908c80d92f342b86314348d5ce53f6bf92832ec4d7531781101c51d8' 
  AND token = 'fg0cN/uU30Z3wNQFpvq76gcSEWgLOVM4254Wdl4ZulQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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