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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266a1fe1efb755218afbab47bb73bbdf6b2845b6cb451b0913950290d6485cb8' 
  AND token = 'bUC4uJBr6szqo5Z81He38v92bYiNzDaXl14YZvoc7s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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