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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a01178a212e6b8ce8dc03862f1dfdd0290ddc0f13ef1ee9b657f54185e4bd40' 
  AND token = 'k+ATERB0hoYgxeJUUE9YT43i+OMtb6i8JxCSvk2yuSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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