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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055fed32308ade4dd0351e365a25ed6f85aebeac909db12588369406e513dc75' 
  AND token = '7L108Ss/O7dIXdiCC6r+kNBppGKGU88WGvtArTq5GI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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