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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa31480a56abddef04b0db9a954eb356acb5853af555a4bec2d1ec073881a80' 
  AND token = 'FUu+6Fcfdzeye6eubWTPbVBJmXno5NVdCjwiMbEAf2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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