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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89b065111ae663c5e0dd2aa6077c8bd2d46fd6f20498808b56ecf75f91182a9' 
  AND token = 'DdyWiRpRk40fp1Y47THCUn7cp/nuMfRRDhLH0/6EcfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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