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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b117b4e214f5dd0441789704888e91b8b28b6457ddaa58b16c1949db2c29e36b' 
  AND token = '7gbf0taqmddbBiY+iIiU3I61tTV40NYUfxJ1569p7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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