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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4951eba9296384eb2e44cfed2b5e0c7124f82442415accb274bb61fa8b587d62' 
  AND token = 'hAWKjHRiD4aa0HejV9JOJRxxwZ/WgN2zBobfzdQkn6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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