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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c054dcf52566ed8771c7176a3f6e102e7c579a2da3954c2e37d753165a056db9' 
  AND token = '3BlzUAEnLvRciyF4LYmj2rHbByrXgKeY6ZpRcXUzU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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