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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600ce6129490bb8a53393f055d5e496ee1c5356551d4c97c59db5d2847ca11f4' 
  AND token = 'LxIQ8AZ4nij2fRUINvlrDavReFrVVq+LbFoU4d+wY2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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