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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638dcc0239ef5d9e5c09eb1f90d4526ad1877db142519f7a63bdd6ae7a9f84c3' 
  AND token = 'wCchWPJcFP76v0OO87McTHxeMFBTsFOVyn2LDoCQtlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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