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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b021cfec2420efaa2ace619e1d0b50c3ab78365d2dd337506dbc7b101bd9197' 
  AND token = 'MaZhM6TrgAzB19lY+JyLMiGvpcLgGQWAJcEWb3w9kig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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