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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbb033f292d15a6f8af09ee432445e73e0eccc34aa23403eb1c9e07838819b5' 
  AND token = 'jgYaLQ23QZ0hCzWXJ8hfdgs4pbdkFgI4aioWaZIEbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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