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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bfb448f29fb1d8c78f0b1854cd04c001ba9dfbe98797a82adfc54d5b77cf5e' 
  AND token = 'I4643qh3Y9rOOSjw7fSmrxPrGkufldcB8ptx1DUw5gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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