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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a2999f57a6b28661ae6e2eece6bbd7c61e7f04e4a6db15738d5c20d8b9f000' 
  AND token = 'ie/CZMM43lu/PQJqk05PYUev6L6eT0edw13a7rN7qUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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