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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97bc46f320c660009e59a5699f8e07b02b3e9f3bea0b60836f974c8c3efe82d' 
  AND token = 'vZSX0Ub5/YmOVkyjCIYqgf+0+IxBmUFd361swREMnBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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