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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c1b999c61eaf97da3300f3844822e16aa2181a11924df068942c7a01d51ef6' 
  AND token = 'EjecMXhsBwcnR5wG8oXa9bYKIX0BoXEG1Z6VM83ZV1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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