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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0842ca59ead07465158ebb199f9fa2d1a6d9ae96b0efb01be4cbde999093d92' 
  AND token = 'hGiMsNIJQLWizTy5Us9ekwtAPbW8cVH0Np2Qm+oo4pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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