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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4646cf3f032ca308efddadc1d3243f481be7329d38d121044cb0a7ba52abacfa' 
  AND token = 'eNCxBEyBa1H/DTtuGoDelUs3JieYJKJkgpYSp5Ip6ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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