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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaafde1bfcc98c57a7b630102f0dbb0e164ba90a90ddecc7869573b3a8e798d' 
  AND token = 'xCOOpm1ShH7fFIL21ilO+w0cnA62oTra0wEakZcNBg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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