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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9cc0c3273691bd8ede14404a3fb54859db320ea3fbb9eca6aa306cbbc7d51b' 
  AND token = 'GhXGn7X0HAd2cz0rbIFJjdQ/LZS2y1YQ7q88pi3QxCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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