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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae802479de04613e874d1a3e30c107b6aae349dbb498bb72b83bb71e1f9bb15b' 
  AND token = 'ckmpcjsJeIwJ5JaqDDGMT1jdp05k571iwNhXAgpz0n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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