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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f2eb3efeeb49970fa63bdf60fafd7a0852b1034a87aff96d071b0e69f724e1' 
  AND token = 'ZheY2Ifk950vy0ptlUX7LbCwUtgS+HZnKZ+bD+vGPtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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