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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d3989b27bf896c109ec500d979b29fd20b2b739a10300ba9d5c92249c66eaf' 
  AND token = 'vP4e8P7AEmIpsy0F4GbHna7YgENo9DAs+g8CKQr7UYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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