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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82abbdb0e395aa2aa6039c1e9a96515c5bfc0d7ac887d2e8f37c08579d7a1019' 
  AND token = 'FA5FV5VUp/NAnV4l90GnDX+3jBS/IIQ2VHhX6JEcwJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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