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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d6405a029ae27b3cd9eab44e2d860a8ec2b1dd758c44bd67a6609bc8f6224d' 
  AND token = 'hruvVPe5+aQ+KAxHW+DB7Zs/OoOQFUIaezod8yNLhj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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