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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbeaa12933decbc0b05930e355045db8aa3a1f6708beb6e211b970bd7982726e' 
  AND token = 'pbWFw0GCnFeUkrE57tLnZxyHL8wxr4sZJSmpvnbjBxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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