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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5085b9059b2bbf6d21d7be2dc65102a47c7743efb8d3b12ded41e1662b86d1e5' 
  AND token = 'Bs1jX2R3tckVgfPkwW1fOKFMYtcQ2W0+NNuCpkx+Ljk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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