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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff810880f8ab135440b677e35ab7d5cf59edd7d648aacf16e0492abda3659fd' 
  AND token = 'dZWmlsJ3N0M10c9dldt1tfrhp6MTMVJyTowNrbdlH2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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