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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9772a32e1666d753ca1276f0b7a45106f1653ae8dd18cd71cd3474a13e4173' 
  AND token = 'ClBO0IkFVksFz4G6y/VsEU3zYrCO1x+d3VtLudenhKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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