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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ea14bc7ee682bc1ade54ea4fad4bbe6dd2afbcfece55c73df73efc2e6b98b3' 
  AND token = 'nMGvhdwVBliQZK/F6NNy2Bvhvualfx00dZAW5IGm9tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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