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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe578bb6339c1f929c14f882c04c5a0dd6cc6e3f3288b4b63c256358798a5562' 
  AND token = 'sAuUn/UWBrMLkdCAkKRju4fX25N3ovNvCs55lj4XMfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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