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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f9f3f1d23062166c1ed39a142f827b256661d0f3c73dad5cb3962126d398ce' 
  AND token = 'eggZlpX6ndz/lex/X5QWkU4JYzQ3Dc+gTaQGtY78D3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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