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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a9c67bd351ab4d935dfd80162769b65d382a63e558eef33c011712c473dced' 
  AND token = 'zMiG6GOqMlWp3scai+s1SM4yP0PG5FTAf1gTO7Pdgw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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