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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb823fa7ab64def2a645a171dad8905bc6d30d12542cb89d2fe50d5159cce47d' 
  AND token = 'suCGxBAfrRpExlJOnjwPudpZ5abGczo863cqN/fS/6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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